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Multifrequency measurements of the effects of soil moisture, soil texture, and surface roughnessAn experiment on remote sensing of soil moisture content was conducted over bare fields with microwave radiometers at the frequencies of 1.4, 5, and 10.7 GHz, during July-September of 1981. Three bare fields with different surface roughnesses and soil textures were prepared for the experiment. The experimental results show that the effect of surface roughness is to increase the soil's brightness temperature and to reduce the slope of regression between brightness temperature and moisture content. The slopes of regression for soils with different textures are found to be comparable and the effect of soil texture is reflected in the difference of regression line intercepts at brightness-temperature axis. Measurements on wet smooth bare fields give lower brightness temperatures at 5 than at 1.4 GHz. This phenomenon is not expected from current radiative transfer theory, using laboratory measurements of the relationship between permittivity and moisture content for different soil-water mixtures at frequencies of not greater than 5 GHz.
Document ID
19830041462
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wang, J. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Oneill, P. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jackson, T. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Engman, E. T.
(U.S. Department of Agriculture, Beltsville Agricultural Research Center Beltsville, MD, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: GE-21
Subject Category
Earth Resources And Remote Sensing
Accession Number
83A22680
Distribution Limits
Public
Copyright
Other

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